/Engine/Plugins/Runtime/RigVM/Source/RigVMDeveloper/Public/RigVMCompiler/RigVMAST.h
An abstract syntax tree cached value expression represents the reference to a variable which needs to be calculated by a call extern expression. The first child of the cached value expression is the var expression to be computed / cached, the second child is the call extern expression to use.
class FRigVMCachedValueExprAST : public [FRigVMExprAST](API\Plugins\RigVMDeveloper\RigVMCompiler\FRigVMExprAST)